The early twenty‑first century confronted air transport with unprecedented security and demand shocks, starting with the terrorist attacks of 11 September 2001. In the immediate aftermath of 9/11, U.S. airspace was temporarily closed, new security regimes were introduced, cockpit access was hardened, and governments created new institutions and screening procedures to reduce hijacking risks. Traffic and revenues fell sharply; in the U.S., passenger volumes did not return to pre‑9/11 levels for several years, and airlines undertook major restructuring, including bankruptcies, consolidation, and business model adjustments.
The 2000s and 2010s also saw strong underlying growth driven by globalization, emerging‑market demand, and the expansion of low‑cost carriers and mega‑hubs, but this growth was periodically interrupted by shocks such as SARS in 2003 and the global financial crisis in 2008–2009. By the late 2010s, global passenger numbers had reached record highs and air travel had become a mass phenomenon in many regions, supported by online booking platforms, ancillary revenue models, and increasingly sophisticated revenue management systems. The COVID‑19 pandemic in 2020, however, produced the most severe disruption in the history of commercial aviation, with international travel collapsing due to border closures and quarantine rules; the recovery that began in late 2020–2021 has been uneven, but it is reshaping fleet strategies, network design, and health‑security practices in lasting ways.
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